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7 . Flo w
C h a r t o f Tr o u b l e s h o o t in g
7-1. Power On
' P o w e r O n' d o e sn o t w o rk
C h e c k th eB a tte ry V o lta g e
ism o reth a n3 .4 V
C 4 0 5 (V IN T) =2 .7 V ?
C h e ck th eC lo ck a t
R 4 0 1 = 3 2 K H Z
C 4 2 4 (+V D D _ IO _ LO W ) &
C 4 2 3 (+V D D _ IO _ H IG H ) ="H "?
C 4 0 2 (+V D D _ G S M _ C O R E )
=1 .8 V ?
C h e ck fo r th eclo ck a t C 3 0 3
=2 6 M H z
C h e ck th ein itia l o p e ra tio n
E N D
Y e s
Y e s
Y e s
Y e s
Y e s
Y e s
Y e s
Y e s
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N o
C h a n g eth eB a tte ry
N o
C h e ck th eP M Ure la te dtoV IN T
N o
R e s o ld e r O S C 4 0 0
N o
C h e ck th ere la te dcircu it
N o
C h e ck th e+V D D _ G S M _ C O R Ecircu it
N o
C h e ck th eclo c k g e n e ra tio ncircu it
(re la te dtoU 1 0 0 )
7- 1
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